121019840 has 56 divisors (see below), whose sum is σ = 289133280. Its totient is φ = 48247808.

The previous prime is 121019831. The next prime is 121019849. The reversal of 121019840 is 48910121.

It is an interprime number because it is at equal distance from previous prime (121019831) and next prime (121019849).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121019849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162509 + ... + 163251.

Almost surely, 2^121019840 is an apocalyptic number.

121019840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121019840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (144566640).

121019840 is an abundant number, since it is smaller than the sum of its proper divisors (168113440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121019840 is an equidigital number, since it uses as much as digits as its factorization.

121019840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1259 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 121019840 is about 11000.9017812178. The cubic root of 121019840 is about 494.6357760086.

Adding to 121019840 its reverse (48910121), we get a palindrome (169929961).

The spelling of 121019840 in words is "one hundred twenty-one million, nineteen thousand, eight hundred forty".